Kindle Ebook freebies?

Can anyone recommend a good kindle freebie to read? Just read a really good one called A Journal of Sin by Darryl Donoghue and fancy another good read. I like thiller, murder mystery/police type books.

The best thing I did was sign up to Bookbub. You tell it what genre of books you like and it wil lsend you a daily email with free or very cheap books available. Then you can just click and order them.

I find ereaderiq better for searching for book bargains. Bookbub is quite limited, Daily Cheapreads is quite good, although they do send details of quite a few books with a religious slant as well, which you can ignore if you're not interested.